What should be the maximum age difference where individuals can date?

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I personally feel that there should be no maximum age difference, just long as both couples are old enough to understand otherwise, and just as long as both are happy. I personally would prefer the limit eighteen through fifty, and maybe even older if the person still looks well. There are many I know, however, who would only give 3 or 5 years, younger or older, as their age difference. So do you think there should be limit? Why or why not? What would personally be your limit?